WO2009021379A1 - Collecteur de courant de batterie au lithium-ion, batterie au lithium-ion cylindrique de grande capacité et son procédé de préparation - Google Patents

Collecteur de courant de batterie au lithium-ion, batterie au lithium-ion cylindrique de grande capacité et son procédé de préparation Download PDF

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Publication number
WO2009021379A1
WO2009021379A1 PCT/CN2007/070457 CN2007070457W WO2009021379A1 WO 2009021379 A1 WO2009021379 A1 WO 2009021379A1 CN 2007070457 W CN2007070457 W CN 2007070457W WO 2009021379 A1 WO2009021379 A1 WO 2009021379A1
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WIPO (PCT)
Prior art keywords
current collector
lithium ion
ion battery
positive
electrode sheet
Prior art date
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Ceased
Application number
PCT/CN2007/070457
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English (en)
Chinese (zh)
Inventor
Xin Li
Rongpeng Zheng
Rongguang Huang
Jianwen Zhang
Yongluan Zhang
Fang Liu
Chiwei Wang
Fuyong Liu
Wenwei Lin
Daotan Liu
Chuntai Guo
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Shenzhen Bak Battery Co Ltd
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Shenzhen Bak Battery Co Ltd
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Priority to PCT/CN2007/070457 priority Critical patent/WO2009021379A1/fr
Publication of WO2009021379A1 publication Critical patent/WO2009021379A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • H01M4/74—Meshes or woven material; Expanded metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • H01M4/74—Meshes or woven material; Expanded metal
    • H01M4/742—Meshes or woven material; Expanded metal perforated material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to the field of lithium ion batteries, and more particularly to a current collector for a lithium ion battery, a high capacity cylindrical lithium ion battery, and a method of preparing the battery.
  • the lithium ion secondary batteries currently on the market are mainly manufactured in two processes: laminated battery and wound battery.
  • the main features of the laminated battery manufacturing are: pre-forming the positive and negative electrodes of the battery with the lead-out electrode
  • the square sheet of the ear, in turn, the positive electrode sheet, the separator, the negative electrode sheet, the separator and the like are sequentially stacked, and then the lead tab and the lead electrode are connected together to be packaged in the shell
  • the main features of the wound battery manufacturing are: The soldering positions of the tabs on the positive and negative plates are intermittently coated. After welding the tabs, the positive and negative electrodes are separated by a separator and then wound into a pole group and then packaged into a package.
  • the laminated battery is generally square in shape, and each pole piece has a tab-out lead to share a large current, so it can be adapted to the requirements of large current discharge, and is mainly applied to a high-capacity, high-power lithium ion secondary battery, which is rolled.
  • the latter pole piece must first be cut into a plurality of square pieces.
  • the cross-cut edge of each piece is prone to defects such as burrs, dust, partial drops, etc. Process control is very difficult, and these are the main causes of internal short circuit of the cell.
  • the reason is also a safety hazard for the future use of the battery core; another disadvantage of using the lamination process is that the production efficiency is low and automation is not easy.
  • the small-capacity battery is fabricated by winding, which is easy to automate and greatly improves the production efficiency.
  • low-power lithium-ion secondary batteries with a capacity of less than 2 Ah, such as mobile phones and notebook computers.
  • the battery because the universal use of monopoles can meet the requirements of use, intermittent coating, with the ear winding process is currently a mainstream production process in the lithium ion secondary battery industry.
  • the object of the present invention is to provide a lithium ion battery current collector capable of improving the capacity and safety of a lithium ion battery in view of the deficiencies of current lithium ion secondary battery products and production processes.
  • Another object of the present invention is to provide a cylindrical lithium having a high capacity and containing the above-mentioned current collector An ion battery and a method of preparing the same.
  • the present invention adopts the following technical solutions:
  • the invention discloses a lithium ion battery current collector, wherein the current collector is provided with a stress dispersion hole.
  • the stress dispersion holes are arranged in a row, and an angle between a center line of each row of stress dispersion holes and a current collector edge line is a non-right angle.
  • the adjacent rows of stress dispersion holes are misaligned.
  • the misalignment distribution means that at most one stress dispersion hole is distributed on the same straight line perpendicular to the side of the current collector.
  • the diameter of the stress dispersion hole is preferably 0.02 to 0.20 mm, and the center line spacing of each row of the stress dispersion holes is 0.5 to 10 times the width of the current collector, and the hole spacing of the stress dispersion holes of the same row is 2 to 10 times the aperture. . .
  • the stress dispersion hole has a diameter of 0.04 to 0.08 mm.
  • the center line of each row of stress dispersion holes and the edge line of the current collector are at an angle of 30 to 60 degrees, preferably
  • the stress dispersion hole is preferably a circular hole.
  • Each row of stress dispersion holes is distributed parallel to each other or in a zigzag pattern.
  • the current collector is a positive electrode current collector, and the current collector is an aluminum foil.
  • the current collector is a negative current collector, and the current collector is a copper foil.
  • the invention also discloses a high-capacity cylindrical lithium ion battery, comprising a positive electrode sheet and a negative electrode sheet, wherein the current collector of the positive electrode sheet is the positive electrode current collector, and/or the current collector of the negative electrode sheet is the above-mentioned negative electrode Current collector.
  • the current collector of the positive electrode sheet and/or the negative electrode sheet is continuously coated with an active material coating, and the active material is reserved on both sides of the current collector.
  • the strip-shaped empty foil portions A and B, the positive electrode sheet, the negative electrode sheet and the separator are wound together to form a pole group, the strip-shaped empty foil portions B on the positive/negative electrode sheets are respectively located at both ends of the pole group, and the positive/negative electrode is taken out
  • the current collectors are respectively taken out from the strip-shaped empty foil portion B on the current collector of the positive/negative electrode sheets.
  • the width of the strip-shaped empty foil portion A is 0.20 to 2.0 mm, and the width of B is 5.0 to 30 mm.
  • the positive electrode active material of the lithium ion battery is a lithium iron phosphate active material, preferably a carbon coated LiFea ⁇ NbacnPO ⁇
  • the invention also discloses a preparation method of a high-capacity cylindrical lithium ion battery, the method comprising:
  • A has a width of 0.20 to 2.0 mm
  • B has a width of 5.0 to 30 mm
  • the current collector of the positive electrode sheet is the above positive electrode.
  • the current collector, and/or the current collector of the negative electrode sheet is the anode current collector described above;
  • the positive electrode sheet, the negative electrode sheet and the separator are wound together to form a pole group, so that the strip-shaped empty foil portions B on the positive/negative electrode sheet are respectively located at both ends of the pole group;
  • the positive/negative lead extraction current collectors are respectively taken out from the strip-shaped empty foil portion B on the current collector of the positive/negative electrode sheets.
  • the invention adopts a stress dispersion hole in the current collector, can disperse and reduce the stress during the expansion of the pole piece/foil, avoid the expansion of the pole piece and reduce the shear stress between the coating and the current collector foil substrate, and ensure the coating. Reliable contact with the current collector foil to reduce the battery capacity and safety hazards caused by partial peeling of the coating.
  • the stress dispersion holes are arranged in a row, and the angle between the center line of each row of stress dispersion holes and the edge line of the current collector is a non-right angle, in particular, a misalignment between adjacent rows of stress dispersion holes, the purpose of which is in the foil
  • the stress dispersion hole is provided on the material collecting fluid, and the tensile strength of the foil can be not excessively reduced, and the film can be cut in the steps of coating, rolling, winding, etc., and the battery can be efficiently produced with high efficiency.
  • the invention adopts a continuous coating process to manufacture a pole piece, and is easy to ensure a thickness tolerance of ⁇ 2 ⁇ m, which improves the uniformity of the coating thickness, enables the battery capacity to be fully exerted, and improves the uniformity of the battery.
  • the invention can avoid the occurrence of slitting burr and improve the safety of the battery while facilitating the high efficiency by leaving the strip-shaped empty foil portion which is not coated with the active material on both sides of the pole piece when coating the active material coating. Winding.
  • the invention adopts lithium iron phosphate-based positive electrode active material, can effectively avoid the explosion reaction, and has the potential to meet the performance requirements of current electric vehicles or electric toys for high-capacity, high-power power batteries.
  • Fig. 1 is a schematic view showing the arrangement of a dispersion stress hole in a positive current collector aluminum foil by a laser drilling process, and 1 is a stress dispersion hole.
  • Fig. 2 is a schematic view showing the strip-shaped empty foils A and B which are not coated with an active material on both sides of the pole piece when the active material coating is continuously applied on the current collector.
  • Fig. 3A is an SEM diagram of an example of a stress dispersion hole in which a positive electrode sheet aluminum foil is processed by a laser drilling process
  • Fig. 3B is an SEM image of a stress dispersion hole in which a negative electrode sheet copper foil is processed by a laser drilling process.
  • Figure 4 is a schematic view showing the surface of a pole group wound on a supporting plastic cylinder, wherein 4 is a positive pole piece, 5 is The diaphragm, 6 is the negative pole piece, and 7 is the PP supporting plastic cylinder.
  • Fig. 5 is a schematic view of the pole group after winding, and an insulating covering structure is designed at both ends of the pole group to prevent direct contact between the pole piece and the casing.
  • Fig. 5A is a schematic view showing that the insulating covering structure is not used, and
  • Fig. 5B is an insulating layer installed.
  • Schematic diagram of the cladding structure 7 is a PP supporting plastic cylinder, 8 is an insulating coating structure, 9 is a positive electrode current collector for extraction, and 10 is a negative electrode current collector for extraction.
  • Figure 6 is a schematic diagram of a lithium ion battery fabricated using the present invention.
  • the high-capacity battery of the present invention specifically refers to a lithium ion secondary battery having a rated capacity (1C) of 4 Ah or more, particularly a lOAh or higher, and a high-capacity battery including a capacity type battery and a high-power type battery, the former having a maximum discharge rate of 2 C or less, large Power type batteries refer to high-power batteries with a maximum discharge rate of 3C or higher.
  • proper process adjustment can be made according to the method and design idea of the present invention, which can produce pure high-capacity batteries, and can also produce high-capacity, large-sized batteries.
  • the object of the present invention can be achieved by designing and manufacturing the following products:
  • the positive electrode material is made of lithium iron phosphate active material
  • the positive and negative electrode sheets are respectively made of aluminum foil and copper foil as a current collector
  • two of the pole pieces are continuously coated with the active material coating.
  • the strip-shaped empty foil parts A and B which are not coated with the active material are reserved on the side, the width of the part A is in the range of 0.20-2.0 mm, and the width of the part B is in the range of 5.0-30 mm, the purpose of leaving the A side is to avoid When the coiled pole piece is cut, the coating is cut to produce burrs and partial blanking.
  • the purpose of leaving the B edge is to connect the current collector to the current collector after continuous coating, the positive pole piece
  • the current collectors for the extraction of the negative electrode tabs are respectively located on both sides of the pole group, and are respectively taken out from the upper and lower cylindrical cover plates, and the cylindrical casing is not charged; 0.5-10 times per interval on the copper foil and/or the aluminum foil
  • the foil width is preliminarily produced with a stress-distributed pore having a diameter of 0.02 to 0.20 mm which is spaced apart before coating the active material.
  • the main function of the stress dispersion hole is to disperse and reduce the stress of the pole piece/foil expansion, avoid the expansion of the pole piece and reduce the shear stress between the coating and the current collector foil substrate, and ensure the coating and the current collector foil. Reliable contact, which reduces the battery capacity and safety hazards caused by partial peeling of the coating.
  • the stress dispersion holes are arranged in a row, and the angle between the center line of each row of stress dispersion holes and the edge line of the current collector is non-right angle, especially the displacement distribution between the adjacent rows of stress dispersion holes, the purpose of which is to avoid the foil material Excessive pores appear on the same straight line perpendicular to the side of the current collector, so that the tensile strength of the foil is excessively lowered, and the film is broken in the steps of coating, rolling, winding, etc., thereby reducing the battery production efficiency.
  • the purpose of the stress dispersion holes being spaced apart and being made into round holes instead of other shaped holes is also It does not excessively reduce the tensile strength of the foil, and avoids fragmentation in processes such as coating, rolling, and winding, and facilitates efficient production of the battery.
  • the stress dispersion hole can also be punched out after the pole piece is coated, but the present invention is not particularly recommended in view of the fact that the punching is likely to cause burrs and partial dropping at the hole, and the present invention will be further explained below.
  • Battery production facilitates a highly efficient winding process, although small square batteries can also be wound, but for high-capacity, high-power lithium
  • a multi-pole process must be used. If a conventional process is used to solder the tabs and then re-wrap in the production process, due to the thickness tolerance of the pole pieces, a plurality of tabs are present. The position after winding is difficult to overlap uniformly, which is inconvenient to connect and lead to the collector.
  • the rigidity and flatness of the ear are not easy to match with the pole piece during high-speed winding, and partial poles are prone to occur.
  • the defect of the ear is in the pole group, and the waste product appears;
  • another disadvantage of the square battery is that the four angular portions are not fully spaced due to the uneven spacing of the positive and negative electrodes, and the battery consistency needs to be improved.
  • the main purpose of the conventional intermittent coating manufacturing positive and negative electrode sheets is to facilitate the welding of the lead tabs.
  • the disadvantage is that the coating thickness precision is difficult to control, and the general thickness tolerance is ⁇ 4 micrometers.
  • the present invention uses a continuous coating process to manufacture the pole pieces, which is easy. The thickness tolerance is guaranteed to be ⁇ 2 microns.
  • the main design ideas for the strip-shaped empty foil parts A and B which are not coated with active materials on both sides of the pole piece when coating the active material coating are: First, reduce the cutting burr to improve battery safety, and second, it is easy to realize High efficiency winding.
  • One of the main causes of ignition of lithium-ion batteries is caused by internal short-circuits. Internal short-circuits are caused by burrs or conductive dust on the edges of the positive and negative electrodes, or lithium dendrites on the negative electrodes and other metal dendrites that break through the ruthenium film, causing positive and The negative electrode is physically short-circuited, and a large amount of Joule heat and chemical reaction heat are generated inside the battery.
  • the electrolyte used in the lithium ion battery is mainly composed of an organic solvent and a lithium salt.
  • the commonly used organic solvents include low boiling points such as EC, DEC, DMC, and PC.
  • Low flash point, low ignition point ester compounds under high temperature conditions, the electrolyte will vaporize or decompose.
  • the safety valve on the cell is opened due to internal pressure increase, the gaseous high temperature organic solvent contacts the oxygen in the air. An oxidative exothermic reaction occurs, which leads to the occurrence of ignition.
  • internal short-circuits must be controlled as much as possible, such as dust control in cell production workshops, high-quality diaphragms, and advanced system control measures such as pole piece cutting equipment.
  • the pole piece is divided into burrs.
  • the system still needs to be improved, and the formation of the slitting burr has a great relationship with the wear of the high-hardness inorganic active material in the pole piece coating.
  • the cutting of the pole piece is only cut to pure For the aluminum foil or copper foil, the grinding of the tool The damage is very slight, and the above burrs can be greatly reduced, so that the safety of the large-capacity battery can be improved.
  • the stress dispersion holes on the copper foil and/or the aluminum foil current collector are spaced apart, and the hole pitch is preferably 2 to 10 times the aperture diameter, and the hole center line is not perpendicular to the edge line of the foil in principle, preferably 30-60.
  • the angle between the angles of the center of each row of stress dispersion holes is 0.5-10 times the width of the foil.
  • the purpose of the design is to reduce and disperse the expansion stress of the high expansion coefficient of the foil without excessively reducing the longitudinal direction of the foil.
  • the stress dispersion hole diameter is designed to be 0.02-0.20mm, especially the control is 0.04-0.08mm.
  • the slurry is easy to contaminate the roll surface during coating; the stress dispersion hole can be processed by laser drilling process or by punching into hole process; the center line spacing of stress dispersion hole is too large, which is not conducive to reducing expansion stress, and the pitch is too small, affecting The strength of the current collector; the distribution pattern of the stress dispersion holes can be appropriately adjusted according to the specific battery size requirements, for example, it can also be distributed in a zigzag manner.
  • the battery positive electrode material of the present invention is made of a lithium iron phosphate-based active material is based on the following analysis:
  • positive electrode materials such as LiCo0 2 , LiNiCoMn0 2 , LiMn 2 0 4 , and LiFeP0 4 are used for research on high-capacity power batteries, but When overcharged, LiCo0 2 cathode material becomes very unstable with the excessive elution of lithium ions, and a hexagonal to monoclinic phase transition occurs. The cobalt ion of Li ⁇ CoO ⁇ will migrate from its plane to lithium.
  • the plane where the ions are located causes the structure to be unstable and releases highly active oxygen, which is prone to intense exothermic reaction with the organic electrolyte and lithium storage anode materials, forming a "thermal runaway” phenomenon, causing accidents such as combustion and explosion.
  • a battery of LiNiCoMnO 2 , LiMn 2 0 4 cathode material also undergoes a similar "thermal runaway” reaction, which presents a serious safety hazard.
  • Lithium iron phosphate (LiFe (M) P0 4 (M is doped Nb, Mn, Co, Mg, etc.) is a very stable P0 4 3 - tetrahedron in the positive electrode material, which plays a structural support role during charge and discharge, especially It does not release high-activity oxygen atoms under overcharge and overheat conditions, and there is no severe oxidation and explosion reaction like cathode materials such as LiCo0 2 , LiNiCoMn0 2 , and LiMn 2 0 4 ; and LiFeP0 during charge and discharge. 4 and FeP0 4 in the completely delithiated state are orthogonal structures, crystal The cell parameters have only minor changes, and the battery has excellent cycle performance. Therefore, the lithium ion battery using LiFeP0 4 as the positive electrode material can effectively avoid the explosion reaction, and has the potential to meet the performance requirements of current electric vehicles or electric toys for high-capacity, high-power power batteries.
  • LiFeP0 4 LiFeP
  • Cell size Housing diameter 50mm, total height 420mm, pole group height 363mm, nominal capacity: 50Ah.
  • the positive electrode active material is 5% carbon-coated LiFe a99 Nb aQ1 P0 4 , the binder is 4 parts of P VDF (brand: Solvay 7200), and the conductive agent is 3 parts of carbon black.
  • the positive current collector is made of aluminum foil with a thickness of 20 microns.
  • the aluminum foil current collector width is 354mm.
  • the aluminum foil is laser-punched for every 30mm interval.
  • a row of stress dispersion holes is used.
  • the hole spacing is 0.5mm
  • the stress dispersion hole diameter is 0.05-0.08mm
  • the stress is dispersed.
  • the center line of the hole is at an angle of 45 degrees to the edge of the foil.
  • the negative electrode active material is made of artificial graphite
  • the adhesive is made of PVDF 3 parts (brand: Solvay 7200)
  • the conductive agent is made of carbon black 2 parts
  • the negative electrode current collector is rolled copper foil with thickness of 12 microns, copper foil current collector width: 360mm
  • the copper foil is wound with a row of stress dispersion holes at intervals of 360mm, the hole spacing is 0.5mm, the stress dispersion hole diameter is 0.05-0.08mm, and the stress dispersion hole center line is at an angle of 45 degrees with the foil edge; when the negative electrode slurry is continuously coated, A strip of empty foil A of 2 mm width is reserved on one side of the copper foil, and a strip of empty foil B of 18 mm width is reserved on the other side, and B is ultrasonically welded to each of the two sides of the copper foil by a thickness of 6 mm and a thickness of 0.05 mm.
  • the copper tab, the positive electrode sheet, the negative electrode sheet and the biaxially oriented porous PE separator having a width of 350 mm and a thickness of 25 ⁇ m are wound together to form a pole group.
  • the basic principle of the winding alignment is the active material coating portion of the positive and negative pole pieces.
  • the longitudinal center line and the diaphragm are superposed on each other in the longitudinal center line, and the strip-shaped empty foil portions B on the positive/negative electrode sheets are respectively located at both ends of the pole group, and the copper tab current collector is bent and led out.
  • Hollow collector copper bolts are used together Ultrasonic welding or laser welding, the other end of the aluminum tab collector is bent and used with the solid collector aluminum bolt for ultrasonic welding or laser welding; hollow collector copper bolt and solid collector aluminum bolt
  • the aluminum cover plate is fastened to the aluminum cover plate through the PFA seal on both sides.
  • the aluminum cover plate and the housing are sealed by laser welding.
  • the battery case is made of aluminum shell, thickness 1mm, no charge, positive and negative
  • the collector current aluminum and copper bolts are respectively taken out from the end portions of the cover plates on both sides of the battery core; after drying, the electrolyte is injected into the battery from the center hole of the hollow collector copper bolt, and the liquid is prefilled/formed and then used.
  • the stainless steel ball is pressed into the center hole to seal, and further divided into 50Ah high capacity cylindrical aluminum shell lithium ion battery.
  • the positive current collector aluminum foil was not subjected to stress dispersion holes as in Example 1.
  • the positive active material was changed to LiMn 2 0 4 , and the rest was the same as in Example 1.
  • the positive active material was changed to LiNiCoMnO, and the rest was the same as in Example 1.
  • the positive active material was changed to LiCo0 2 , and the rest was the same as in Example 1.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention a pour objet un collecteur de courant de batterie au lithium-ion qui est pourvu de trous de répartition de contrainte. La présente invention a aussi pour objet une batterie au lithium-ion cylindrique et son procédé de préparation, la batterie comprenant ledit collecteur de courant.
PCT/CN2007/070457 2007-08-10 2007-08-10 Collecteur de courant de batterie au lithium-ion, batterie au lithium-ion cylindrique de grande capacité et son procédé de préparation Ceased WO2009021379A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/070457 WO2009021379A1 (fr) 2007-08-10 2007-08-10 Collecteur de courant de batterie au lithium-ion, batterie au lithium-ion cylindrique de grande capacité et son procédé de préparation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/070457 WO2009021379A1 (fr) 2007-08-10 2007-08-10 Collecteur de courant de batterie au lithium-ion, batterie au lithium-ion cylindrique de grande capacité et son procédé de préparation

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Publication Number Publication Date
WO2009021379A1 true WO2009021379A1 (fr) 2009-02-19

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CN109585905A (zh) * 2018-12-24 2019-04-05 广东维都利新能源有限公司 一种弧形软包装锂电池及其制作方法
CN111554876A (zh) * 2020-05-06 2020-08-18 力神动力电池系统有限公司 一种锂离子动力电池的新型免分切极片结构
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CN113488617A (zh) * 2021-05-08 2021-10-08 上海兰钧新能源科技有限公司 一种锂离子电池极片的制备方法
CN113725475A (zh) * 2020-05-26 2021-11-30 深圳格林德能源集团有限公司 一种改善锂离子电池负极片第一折痕处掉粉现象的方法
CN114597332A (zh) * 2021-12-02 2022-06-07 万向一二三股份公司 一种增加极片抗拉强度的高能量密度极片结构
CN115020630A (zh) * 2022-06-23 2022-09-06 三一技术装备有限公司 极片和极片单元的加工方法、极片、电池和极耳辊切装置

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CN108574082A (zh) * 2018-04-27 2018-09-25 湘潭银河新能源有限公司 电池极片及其制备方法和电池
CN108574082B (zh) * 2018-04-27 2024-04-26 湘潭银河新能源有限公司 电池极片及其制备方法和电池
CN109585905A (zh) * 2018-12-24 2019-04-05 广东维都利新能源有限公司 一种弧形软包装锂电池及其制作方法
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CN111554876A (zh) * 2020-05-06 2020-08-18 力神动力电池系统有限公司 一种锂离子动力电池的新型免分切极片结构
CN113725475A (zh) * 2020-05-26 2021-11-30 深圳格林德能源集团有限公司 一种改善锂离子电池负极片第一折痕处掉粉现象的方法
CN113725475B (zh) * 2020-05-26 2023-05-30 深圳格林德能源集团有限公司 一种改善锂离子电池负极片第一折痕处掉粉现象的方法
CN113488617A (zh) * 2021-05-08 2021-10-08 上海兰钧新能源科技有限公司 一种锂离子电池极片的制备方法
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CN115020630A (zh) * 2022-06-23 2022-09-06 三一技术装备有限公司 极片和极片单元的加工方法、极片、电池和极耳辊切装置

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